U.S. patent application number 15/504182 was filed with the patent office on 2017-09-28 for backlight unit and display device.
The applicant listed for this patent is BOE OPTICAL SCIENCE AND TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.. Invention is credited to Wenjun LI.
Application Number | 20170276865 15/504182 |
Document ID | / |
Family ID | 54950255 |
Filed Date | 2017-09-28 |
United States Patent
Application |
20170276865 |
Kind Code |
A1 |
LI; Wenjun |
September 28, 2017 |
BACKLIGHT UNIT AND DISPLAY DEVICE
Abstract
A backlight unit includes a backplane and a light guide plate.
The backplane includes a body section and a bending section
connected with the body section; the body section includes a first
surface and a second surface opposite to each other; the bending
section includes at least a connecting portion and a mounting
portion extended from the connecting portion and opposite to the
first surface; the connecting portion is a bending structure along
a first side of the body section; a bending direction of the
connecting portion is a direction from the second surface of the
body section to the first surface; the light guide plate is
disposed on the first surface of the body section; one side of the
mounting portion away from the connecting portion is opposite to a
first end face of the light guide plate; and light sources are
disposed on the mounting portion. A display device is further
disclosed.
Inventors: |
LI; Wenjun; (Beijing,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BOE TECHNOLOGY GROUP CO., LTD.
BOE OPTICAL SCIENCE AND TECHNOLOGY CO., LTD. |
Beijing
Suzhou, Jiangsu |
|
CN
CN |
|
|
Family ID: |
54950255 |
Appl. No.: |
15/504182 |
Filed: |
July 13, 2016 |
PCT Filed: |
July 13, 2016 |
PCT NO: |
PCT/CN2016/089894 |
371 Date: |
February 15, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 6/0068 20130101;
G02B 6/0081 20130101; G02B 6/0088 20130101; G02F 1/133602 20130101;
G02B 6/0073 20130101; G02F 1/133615 20130101; G02B 6/0065
20130101 |
International
Class: |
F21V 8/00 20060101
F21V008/00; G02F 1/1335 20060101 G02F001/1335 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 29, 2015 |
CN |
201510726872.0 |
Claims
1. A backlight unit, comprising a backplane and a light guide plate
(LGP), wherein the backplane includes a body section and a bending
section connected with the body section; the body section includes
a first surface and a second surface opposite to each other; the
bending section includes at least a connecting portion and a
mounting portion extended from the connecting portion and opposite
to the first surface; the connecting portion is a bending structure
along a first side of the body section; a bending direction of the
connecting portion is a direction from the second surface of the
body section to the first surface; the LGP is disposed on the first
surface of the body section; one side of the mounting portion away
from the connecting portion is opposite to a first end face of the
LGP; and light sources are disposed on the mounting portion.
2. The backlight unit according to claim 1, wherein a first zigzag
structure is provided on one side of the mounting portion provided
with the light sources; and a size of notches of the first zigzag
structure matches with a size of the light sources.
3. The backlight unit according to claim 2, wherein the mounting
portion includes a bonding surface opposite to the first surface;
the plurality of light sources are disposed on one side of the
mounting portion provided with the first zigzag structure, and are
sequentially arranged on a light bar; the light bar is bonded to
the bonding surface of the mounting portion; and the plurality of
light sources are sequentially arranged along the notches of the
first zigzag structure.
4. The backlight unit according to claim 2, wherein the connecting
portion is in a flat plate structure or a cambered plate structure
which is perpendicular to the first surface along the first side of
the body section; and the mounting portion is in a flat plate
structure parallel to the first surface.
5. The backlight unit according to claim 3, wherein a width D1 of
the notches of the first zigzag structure satisfies
3.2.ltoreq.D1.ltoreq.4.4.
6. The backlight unit according to claim 5, wherein the mounting
portion is parallel to the first surface; and a distance H1 between
the first surface and one side of the mounting portion away from
the first surface satisfies 0.4.ltoreq.H1.ltoreq.0.6.
7. The backlight unit according to claim 6, wherein a depth K3 of
the notches of the first zigzag structure satisfies
0.8.ltoreq.K3.ltoreq.1.3.
8. The backlight unit according to claim 1, wherein a distance K2
from one side of the mounting portion, which side is away from the
connecting portion, to the connecting portion satisfies
1.3.ltoreq.K2.ltoreq.2.0.
9. The backlight unit according to claim 1, wherein the bending
section and the body section are of an integrated structure.
10. The backlight unit according to claim 8, wherein the bending
section and the body section are of an integrated structure.
11. The backlight unit according to claim 1, wherein the LGP is in
a wedge structure; a thickness of the first end face of the LGP is
greater than that of a second end face of the LGP; and the first
end face and the second end face are disposed on both sides of the
LGP.
12. The backlight unit according to claim 2, wherein a first space
is defined by the connecting portion, the mounting portion and the
first surface.
13. The backlight unit according to claim 12, further comprising
sealant, wherein the sealant at least includes a bearing portion
matching with the first space; the bearing portion includes a
second zigzag structure; and a shape of the second zigzag structure
matches with that of the first zigzag structure.
14. The backlight unit according to claim 13, wherein a width D2 of
notches of the second zigzag structure and a width D1 of the
notches of the first zigzag structure satisfy D2.gtoreq.D1.
15. The backlight unit according to claim 14, wherein a depth K5 of
the notches of the second zigzag structure and a depth K3 of the
notches of the first zigzag structure satisfy K5.ltoreq.K3.
16. The backlight unit according to claim 2, wherein the light
sources are light-emitting diodes (LEDs).
17. The backlight unit according to claim 1, wherein the backplane
is made from aluminum, aluminum alloy or steel.
18. A display device comprising the backlight unit according to
claim 1.
19. The display device according to claim 18, wherein a first
zigzag structure is provided on one side of the mounting portion
provided with the light sources; and a size of notches of the first
zigzag structure matches with a size of the light sources.
20. The display device according to claim 19, wherein the mounting
portion includes a bonding surface opposite to the first surface;
the plurality of light sources are disposed on one side of the
mounting portion provided with the first zigzag structure, and are
sequentially arranged on a light bar; the light bar is bonded to
the bonding surface of the mounting portion; and the plurality of
light sources are sequentially arranged along the notches of the
first zigzag structure.
Description
TECHNICAL FIELD
[0001] Embodiments of the present disclosure relate to the field of
display technology, in particular to a backlight unit and a display
device.
BACKGROUND
[0002] The method of improving the display brightness of the
display device by improving the brightness of a single light source
and/or increasing the number of light sources will result in the
increased heat output of the light source or the light sources. If
the heat cannot be dissipated out in time, the temperature of the
light source(s) and areas near the light source(s) will be raised,
so that the service life of the light source(s) can be affected,
and other adjacent optical components can be deformed. For
instance, in a display device which takes light-emitting diodes
(LEDs) as light sources, when the brightness of the LEDs is higher
than lumen (Lm), after the LEDs are lightened at a rated current
and operate for a period of time, local temperature around the LEDs
will be gradually raised and exceed 55.degree. C. Once the
temperature of the LEDs is higher than 55.degree. C., a light guide
plate (LGP) and a reflector plate making tight contact with the
LEDs may produce irreversible bending deformation due to high
temperature. In addition, if the number of the LEDs in a light bar
is larger, the accumulated heat energy is larger, and hence the
possibility of adverse effects is higher.
SUMMARY
[0003] One aspect of the present disclosure provides a backlight
unit. The backlight unit comprises a backplane and a light guide
plate (LGP); the backplane includes a body section a bending
section connected with the body section; the body section includes
a first surface a second surface opposite to each other; the
bending section includes at least a connecting portion and a
mounting portion extended from the connecting portion and opposite
to the first surface; the connecting portion is a bending structure
along a first side of the body section; a bending direction of the
connecting portion is a direction from the second surface of the
body section to the first surface; the LGP is disposed on the first
surface of the body section; one of the mounting portion away from
the connecting portion is opposite to a first end face of the LGP;
and light sources are disposed on the mounting portion.
[0004] For example, a first zigzag structure is provided on one
side of the mounting portion provided with the light sources; and a
size of notches of the first zigzag structure matches with a size
of the light sources.
[0005] For example, the mounting portion includes a bonding surface
opposite to the first surface; the plurality of light sources are
disposed on one side of the mounting portion provided with the
first zigzag structure, and are sequentially arranged on a light
bar; the light bar is bonded to the bonding surface of the mounting
portion; and the plurality of light sources are sequentially
arranged along the notches of the first zigzag structure.
[0006] For example, the connecting portion is in a flat plate
structure or a cambered plate structure which is perpendicular to
the first surface along the first side of the body section; and the
mounting portion is in a flat plate structure parallel to the first
surface.
[0007] For example, a width D1 of the notches of the first zigzag
structure satisfies 3.2.ltoreq.D1.ltoreq.4.4.
[0008] For example, the mounting portion is parallel to the first
surface; and a distance H1 between the first surface and one side
of the mounting portion away from the first surface satisfies
0.4.ltoreq.H1.ltoreq.0.6.
[0009] For example, a depth K3 of the notches of the first zigzag
structure satisfies 0.8.ltoreq.K3.ltoreq.1.3.
[0010] For example, a distance K2 from one side of the mounting
portion, which side is away from the connecting portion, to the
connecting portion satisfies 1.3.ltoreq.K2.ltoreq.2.0.
[0011] For example, the bending section and the body section are of
an integrated structure.
[0012] For example, the bending section and the body section are of
an integrated structure.
[0013] For example, the LGP is in a wedge structure; a thickness of
the first end face of the LGP is greater than that of a second end
face of the LGP; and the first end face and the second end face are
disposed on both sides of the LGP.
[0014] For example, a first space is defined by the connecting
portion, the mounting portion and the first surface.
[0015] For example, the backlight unit further comprises sealant,
the sealant at least includes a bearing portion matching with the
first space; the bearing portion includes a second zigzag
structure; and the shape of the second zigzag structure matches
with that of the first zigzag structure.
[0016] For example, a width D2 of notches of the second zigzag
structure and a width D1 of the notches of the first zigzag
structure satisfy D2.gtoreq.D1.
[0017] For example, a depth K5 of the notches of the second zigzag
structure and a depth K3 of the notches of the first zigzag
structure satisfy K5.ltoreq.K3.
[0018] For example, the light sources are light-emitting diodes
(LEDs).
[0019] For example, the backplane is made from aluminum, aluminum
alloy or steel.
[0020] Another aspect of the present disclosure provides a display
device comprising any one of the foregoing backlight units.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to clearly illustrate the technical solution of the
embodiments of the disclosure, the drawings of the embodiments will
be briefly described in the following; it is obvious that the
described drawings are only related to some embodiments of the
disclosure and thus are not limitative of the disclosure.
[0022] FIG. 1a is a schematic structural view of a backplane in an
embodiment of the present disclosure;
[0023] FIG. 1b is a sectional view of FIG. 1a along line A-A;
[0024] FIG. 2a is a schematic structural view of sealant in an
embodiment of the present disclosure;
[0025] FIG. 2b is a sectional view of FIG. 2a along line B-B;
[0026] FIG. 3a is a schematic diagram illustrating the assembly of
sealant and a backplane including an LGP and a reflector plate in
an embodiment of the present disclosure;
[0027] FIG. 3b is a sectional view of FIG. 3a along line C-C;
[0028] FIG. 4a is a schematic sectional view of a part between an
incident section and a luminous section of the backlight unit
provided by an embodiment of the present disclosure along the
direction perpendicular to line A-A of the backplane;
[0029] FIG. 4b is a schematic sectional view of the incident
section of the backlight unit provided by an embodiment of the
present disclosure along line A-A of the backplane; and
[0030] FIG. 4c is a schematic sectional view of the luminous
section of the backlight unit provided by an embodiment of the
present disclosure along line A-A of the backplane.
DETAILED DESCRIPTION
[0031] In order to make objects, technical details and advantages
of the embodiments of the disclosure apparent, the technical
solutions of the embodiments will be described in a clearly and
fully understandable way in connection with the drawings related to
the embodiments of the disclosure. Apparently, the described
embodiments are just a part but not all of the embodiments of the
disclosure. Based on the described embodiments herein, those
skilled in the art can obtain other embodiment(s), without any
inventive work, which should be within the scope of the
disclosure.
[0032] In an edge type display device, a backlight unit, for
instance, may comprise a backplane and a light guide plate (LGP)
disposed on one side of the backplane; a reflector plate and the
like are disposed between the LGP and the backplane; optical films
are disposed on one side of the LGP away from the backplane; the
optical films include, for instance, a diffuser plate, a lower
prism or an upper prism; one side of the optical film, for
instance, may also be provided with a light-shielding adhesive
tape; an outer edge encircling the backplane is, for instance,
provided with sealant with a specific thickness; and the sealant is
arranged so as to fix the optical components from the periphery.
The sealant is generally made from a non-metallic material such as
rubber and resin. Light sources are oppositely arranged on an end
face on one side of an incident section of the LGP. The light
sources may be disposed on the sealant. If the light sources are
disposed on the sealant, the heat produced by the light sources
cannot be effectively discharged in time, so that the service life
of the light sources can be disadvantageously affected. In
addition, the heat produced by the light sources, for instance, can
result in the deformation of the optical components such as the LGP
and the reflector plate.
[0033] An embodiment of the present disclosure provides a backlight
unit, which comprises a backplane and an LGP, wherein the backplane
includes a body section and a bending section connected with the
body section; the body section includes a first surface and a
second surface opposite to each other; the bending section includes
at least a connecting portion and a mounting portion extended from
the connecting portion and opposite to the first surface; the
connecting portion is a bending structure along a first side of the
body section; the bending direction of the connecting portion is
the direction from the second surface of the body section to the
first surface; the LGP is disposed on the first surface of the body
section; one side of the mounting portion away from the connecting
portion is opposite to a first end face of the LGP; and light
sources are disposed on the mounting portion.
[0034] The backplane is, for instance, a heat-conducting piece,
e.g., a component made from a metallic material such as aluminum,
aluminum alloy or steel. For instance, one layer of copper may also
be plated on a surface of a metallic aluminum component to improve
the thermal conductivity. The light source is, for instance, an
LED. The first end face of the LGP is an incident surface of the
LGP. The backlight unit provided by the embodiment of the present
disclosure, for instance, may improve the radiating efficiency of
the light sources and prolong the service life of the light
sources, and may also protect optical components near the light
sources from being deformed due to the accumulated heat output from
the light sources.
[0035] It should be know by those skilled in the art that the LGP
is oppositely arranged on the first surface of the body section of
the backplane. The connecting portion, for instance, may be the
bending structure opposite to the first side of the body section,
and the bending direction is, for instance, the direction towards
one side of the first surface. For instance, the connecting portion
and the first surface of the body section of the backplane are at
certain included angle. For instance, the connecting portion is
perpendicular to the first surface of the body section of the
backplane. The connecting portion, for instance, may be a structure
formed by repeated bending on one side of the backplane; for
instance, a stepped shape is formed on a side surface. The
connecting portion, for instance, may also be a structure formed by
repeating the process for a plurality of times: the backplane is
bent along the direction from the second surface to the first
surface at first, and hence bent towards the first surface and
attached to the first surface. The structural stability and the
heat dissipation effect of the bending section can be
simultaneously improved by increasing the contact area of the
connecting portion and different positions of the first surface.
The mounting portion shall include a part which is extended
opposite to the first surface of the body section, and the light
sources are mounted in the part of the mounting portion. The
mounting portion, for instance, may be parallel to the first
surface or at certain included angle. The mounting portion includes
a bonding surface opposite to the first surface, and a light bar of
LEDs or the like is bonded to the bonding surface. The forming
means of the bending section, for instance, may also be that the
bending section is formed simultaneously when the backplane is
formed, namely the bending section and the body section of the
backplane are in an integrated structure which is simultaneously
formed. The bending section, for instance, may also be
independently formed at first and hence assembled together with the
body section of the backplane.
[0036] In one embodiment, the bending section of the backplane, for
instance, may be a structure formed by bending of the backplane
twice, on one side of the backplane, towards one side provided with
the LGP, as illustrated in FIGS. 1a and 1b, in which FIG. 1a is a
schematic structural view of a backplane provided by one embodiment
of the present disclosure, and FIG. 1b is a sectional view of FIG.
1a along line A-A. In addition, thick lines in FIG. 1b represent a
backplane 8, and thin lines, for instance, represent an LGP
disposed on a first surface 83 of the backplane 8. As illustrated
in FIGS. 1a and 1b, after double bending of the backplane 8, a
bending section of the backplane 8 is formed by a bent part of the
backplane 8. The bending section includes a connecting portion 80
and a mounting portion 81. The connecting portion 80 is connected
with a first side of the backplane 8 and is basically perpendicular
to the first surface 83 of the backplane 8. The mounting portion 81
is used for mounting light sources and is basically parallel to the
first surface 83. The light sources shall be arranged opposite to
an incident section of the LGP. FIG. 1b also illustrates a second
surface 84 of the backplane 8 opposite to the first surface 83. The
connecting portion 80 as illustrated in the figure is a part of the
backplane formed by first-time bending on one side of the
backplane, and the mounting portion 81 as illustrated in the figure
is a part formed by second-time bending on the basis of first-time
bending.
[0037] In one embodiment, the bending section of the backplane is
formed by double bending, and a zigzag structure is formed on one
side of the mounting portion away from the connecting portion.
Continuing to refer to FIGS. 1a and 1b, as described above, the
backplane 8 includes a body section and a bending section; the
bending section includes a mounting portion 81; the mounting
portion 81 is basically parallel to a first surface 83 of the
backplane 8; and the connecting portion 80 is basically
perpendicular to the first surface 83. The width of the mounting
portion 81 (namely the distance from one side of the mounting
portion, which side is away from the connecting portion, to the
connecting portion) should better not affect the size of a display
region. The mounting portion 81 includes a bonding surface opposite
to the first surface 83. A first zigzag structure 82 is disposed on
one side of the mounting portion 81 provided with the light
sources. The size of each notch in the first zigzag structure 82
matches with the size of correspondingly mounted light source,
which is as described below: a plurality of light sources are
sequentially disposed on, for instance, an elongated light bar; the
light bar is bonded to the bonding surface of the mounting portion
81; and the plurality of light sources are sequentially arranged
along the notches of the first zigzag structure 82. As the light
bar is bonded to the bonding surface of the mounting portion 81,
the contact area of the light bar and the mounting portion 82 can
be effectively increased, and hence the heat dissipation effect of
the light sources in the backlight unit can be improved.
[0038] In one embodiment of the present disclosure, the size of the
notch of the first zigzag structure may be optimized. For instance,
the three types of LED light sources used in the current smart
mobile phones include 3.8.times.1.0.times.0.6,
3.0.times.1.0.times.0.5 and 3.0.times.0.8.times.0.4
(length.times.width.times.height, unit mm). Thus the size of the
connecting portion, the mounting portion and the notch may be
optimized according to the size of the three types of LEDs.
Continuing to refer to FIG. 1a, the mounting portion 81 is parallel
to the first surface 83, and the connecting portion 80 is
perpendicular to the first surface 83. For instance, the width D1
of the notch of the first zigzag structure 82 satisfies 3.2
mm.ltoreq.D1.ltoreq.4.4 mm; for instance, the distance H1 between
the first surface 83 and one side of the mounting portion 81 away
from the first surface 83 satisfies 0.4 mm.ltoreq.H1.ltoreq.0.6 mm;
for instance, the depth K3 of the notch of the first zigzag
structure 82 satisfies 0.8 mm.ltoreq.K3.ltoreq.1.3 mm; and for
instance, the distance K2 from one side of the mounting portion 81
away from the connecting portion 80 to the connecting portion 80
satisfies 1.3 mm.ltoreq.K2.ltoreq.2.0 mm. The distance K2 is mainly
selected on the basis of the theoretical foundation of the maximum
incident distance (the distance from a luminous surface of the LED
to a window in a light-shielding adhesive tape) and the maximum
visible range; one value which gives attention to two aspects is
selected; the value is specifically determined according to actual
design requirement; and generally, the incident distance is ranged
from 0.28 mm to 0.32 mm. As for a display device adopting other
types of LEDs, the size of the connecting portion, the mounting
portion and the first zigzag structure may be correspondingly
adjusted. As the size of the connecting portion, the mounting
portion and the notch is optimized, the LEDs can be better matching
with the mounting portion, so that the heat dissipation effect can
be effectively improved when ensuring the safe operation of the
light sources.
[0039] In another embodiment of the present disclosure, the bending
section of the backplane is formed by double bending as described
above. A first space is defined by the connecting portion 80, the
mounting portion 81 and the first surface 83 of the backplane
together. The first space may affect the bearing strength of the
bending section. As illustrated in FIGS. 2a and 2b, one part of
sealant may be designed to be of a structure matching with the
first space. FIG. 2a is a schematic structural view of the sealant
in the embodiment of the present disclosure, and FIG. 2b is a
sectional view of FIG. 2a along line B-B. As illustrated in FIG.
2a, a plan view of sealant 6 in the backlight unit is basically a
rectangular hollow structure, so that the optical components
(including the LGP) can be fixed by the sealant 6 from the
periphery. The sealant 6 is fixed on an outer edge of the first
surface 83 of the backplane 8 in three directions via a
double-faced adhesive tape. The sealant 6 also includes a bearing
portion 60 matching with the first space; a second zigzag structure
61 is disposed on one side of the bearing portion 60; the shape of
the second zigzag structure 61 matches with that of the first
zigzag structure 82; the bearing portion 60 is inserted into the
first space to improve the bearing strength of the bending section
of the backplane 8; and the second zigzag structure 61 matches with
the first zigzag structure 82 to ensure smooth mounting of the
light sources such as the LEDs.
[0040] In one embodiment of the present disclosure, the size of the
second zigzag structure 61 may be optimized. Continuing to refer to
FIG. 2a, the width D2 of notches of the second zigzag structure 61
and the width D1 of the notches of the first zigzag structure 82
satisfies D2.gtoreq.D1, so that the distance between both ends of
the light source and both sides of the notch of the first zigzag
structure 82 can be closer, and hence the heat dissipation effect
can be improved. For instance, the depth K5 of the notch of the
second zigzag structure 61 and the depth K3 of the notch of the
first zigzag structure 82 satisfies K5.ltoreq.K3; and for instance,
the distance K4 from the outside of the second zigzag structure 61
to the other side of the bearing portion 60 and the distance K2
from the outside of the first zigzag structure 82 to the connecting
portion 80 satisfies K4.gtoreq.K2. As illustrated in FIG. 2b,
wherein, h refers to the thickness of a fitting part of the
backplane; in order to ensure that the bearing portion 60 can be
inserted into the first space, "h.ltoreq.H1-thickness of materials
of backplane" shall be guaranteed; for instance, "h=H-thickness of
materials of backplane" is designed, so that the bearing portion 60
can be tightly bonded to the first space, and hence the structural
stability can be improved; and for instance, a certain gap is
formed between the bearing portion 60 and the mounting portion 81
and between the bearing portion 60 and the connecting portion 80,
and the gap, for instance, may be 0.01 mm-0.05 mm, so that the heat
dissipation effect at the fitting part of the bending section and
the bearing portion 60 can be improved. A bottom surface 62 of the
sealant is fixed on the backplane 8 through an adhesive tape. The
bottom surface 62 of the sealant adopts submergence design, and the
submergence depth h1 is equal to the thickness of the fixing
adhesive tape. The optional fixing adhesive tape, for instance,
includes two specifications. The thickness of the fixing adhesive
tape with the two specifications is respectively 0.05 mm and 0.06
mm. The submergence design of the bottom surface 62 of the sealant
ensures that the sealant is tightly bonded to the backplane close
to one side of the backplane after being fixed on the backplane
through the fixing adhesive tape, so that the structural stability
can be improved.
[0041] FIG. 3a is a schematic diagram illustrating the matching
between the sealant and the backplane, and FIG. 3b is a schematic
diagram of FIG. 3a along line C-C. As illustrated in FIGS. 3a and
3b, a plan view of the sealant 6 is a rectangular hollow structure.
The sealant 6 is fixed on the first surface 83 along an edge of the
first surface 83 of the body section of the backplane 8; one end of
the sealant 6 provided with the bearing portion 60 is inserted into
the first space; and the bearing portion 60 is tightly matching
with the first space. The shape and the size of the second zigzag
structure 61 of the sealant 6 match with the shape and the size of
the first zigzag structure 82 of the bending section of the
backplane. FIG. 3b illustrates the relative position of a reflector
plate 5 and an LGP 10; the LGP 10 is disposed on one side of the
first surface 83 of the body section of the backplane; and the
reflector plate 5 is bonded to one side of the LGP 10 close to the
first surface 83. The inside of the sealant 6 abuts against outer
edges of both the LGP 10 and the reflector plate 5. Light sources
(not shown in the figure) are disposed on one side of an end face
(the end face is an incident surface of the LGP) of the bending
section opposite to the LGP 10.
[0042] FIGS. 4a to 4c are schematic structural views of a backlight
unit provided by one embodiment of the present disclosure. FIG. 4a
is a schematic sectional view of a part of the backlight unit
between an incident portion and a luminous portion along the
direction perpendicular to line A-A (as illustrated in FIG. 1a) of
the backplane; FIG. 4b is a schematic sectional view of the
incident portion of the backplane along line A-A of the backplane;
and FIG. 4c is a schematic sectional view of the luminous portion
of the backplane along line A-A of the backplane.
[0043] As illustrated in FIG. 4a, a reflector plate 5, an LGP 10, a
diffuser plate 4, a lower prism 3, an upper prism 2 and
light-shielding adhesive tapes 1 are sequentially arranged on the
first surface 83 of the body section of the backplane. Sealant 6 is
disposed at an edge of the first surface 83 of the backplane 8, and
a bottom surface of the sealant 6 is fixed on the first surface 83
of the backplane 8 through a fixing adhesive tape 7.
[0044] As illustrated in FIG. 4b, the LGP 10 is disposed on one
side of the first surface 83 of the body section of the backplane;
the reflector plate 5 is bonded to one side of the LGP 10 close to
the backplane; and optical films such as the diffuser plate 4, the
lower prism 3 and the upper prism 2 are sequentially disposed on
the other side. The backplane 8 includes a bending section; the
bending section includes a connecting portion 80 which is basically
perpendicular to the first surface 83 of the backplane, and a
mounting portion 81 parallel to the first surface 83; and LEDs 91
are mounted on one side of the mounting portion 81 away from the
connecting portion 80 and are arranged facing an end face (incident
surface) of the LGP 10. The LEDs 91 are sequentially arranged on a
light bar 9 which is bonded to a bonding surface of the mounting
portion 81 opposite to the first surface 83. The light bar 9 may
include, for instance, an elongated printed circuit board (PCB) and
light sources sequentially arranged on this PCB.
[0045] As described above, a first space is defined by the
connecting portion 80, the mounting portion 81 and the first
surface 83 opposite to the mounting portion 81 together. As
illustrated in FIG. 4b, a bearing portion 60 of the sealant 6 is
inserted into the first space (as different from bottom surfaces of
the sealant in other three directions, one side of the bearing
portion close to the first surface of the backplane may also be not
fixed through the fixing adhesive tape), so that the bearing
strength of the bending section can be improved. For instance, a
first zigzag structure 82 is disposed on one side of the mounting
portion 81 away from the connecting portion 80; and the bearing
portion 60 of the sealant 6 includes a second zigzag structure 61
matching with the first zigzag structure 82. After the light bar 9
is bonded to the bonding surface of the mounting portion 81, a
plurality of LEDs 91 are just disposed in notches of the first
zigzag structure 82.
[0046] In the embodiment, as illustrated in FIG. 4b, one side of
the LGP 10 close to the bending section is in a wedge structure of
which the thickness is gradually reduced from one side of the LGP
10 close to the bending section of the backplane to one side of the
LGP away from the bending section of the backplane, so that the
amount of incident light of the LGP can be increased, and hence the
brightness of the backlight unit can be improved. As illustrated in
FIG. 4b, one part of the light bar is bonded to the outside of the
wedge structure of the LGP 10, so that the stability of the light
bar can be improved. The light-shielding adhesive tape 1 may also
cover one side of the backlight unit away from the backplane, so
that the light leakage of the backlight unit can be avoided, and
hence the display brightness of corresponding display device can be
improved.
[0047] As illustrated in FIG. 4c, a reflector plate 5, an LGP 10, a
diffuser plate 4, a lower prim 3, an upper prism 2 and
light-shielding adhesive tapes 1 are sequentially arranged on the
first surface of the body section of the backplane. One end of the
LGP 10 and other optical film(s) away from the bending section is
fixed through sealant 6, and a bottom surface of the sealant 6 is
fixed on the backplane 8 through a fixing adhesive tape 7.
[0048] An embodiment of the present disclosure further provides a
display device comprising the foregoing backlight unit. The display
device has the advantages of good heat dissipation effect, long
service life of light sources and higher display brightness.
[0049] In this text, the terms "first", "second" and the like are
only used for distinguishing one entity or operation from another
entity or operation and do not indicate or imply any relationship
or sequence between the entities or operations. The terms
"comprise", "include" and the like are open expression and do not
exclude other elements in the process, method and object.
[0050] It should be also noted that the orientation or position
relationship indicated by "on", "beneath" and the like is based on
the orientation or position relationship as illustrated in the
accompanying drawings, are only used for convenient description of
the present disclosure and simplified description, do not indicate
or imply that the referred device or element must have specific
orientation and be constructed and operated in specific
orientation, and hence should not be construed as the limitation of
the present disclosure.
[0051] Unless otherwise specified, the terms "arranged",
"connected" and "connection" should be understood in a broad sense,
for instance, may refer to fixed connection and may also refer to
detachable connection or integrated connection; may refer to
mechanical connection and may also refer to electrical connection;
may refer to direct connection and may also refer to indirect
connection through an intermediate medium; and may refer to the
communication of the inside of two elements. The specific meaning
of the terms in the present disclosure shall be understood by those
skilled in the art according to specific conditions.
[0052] The above preferred embodiments may be mutually combined, do
not depart from the scope of the present disclosure, and can obtain
better combination effect.
[0053] The application claims priority to the Chinese patent
application No. 201510726872.0, as filed Oct. 29, 2015, the
disclosure of which is incorporated herein by reference as part of
the application.
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